<!-- 充电时长图 -->
<template>
  <el-card>
    <div :id="id" :class="className" :style="{ height, width }"></div>
  </el-card>
</template>

<script setup lang="ts">
import * as echarts from "echarts";

const props = defineProps({
  id: {
    type: String,
    default: "firChart",
  },
  className: {
    type: String,
    default: "",
  },
  width: {
    type: String,
    default: "200px",
    required: true,
  },
  height: {
    type: String,
    default: "200px",
    required: true,
  },
});

const options = {
  title: {
    text: '充电时长',
    right:"center"
  },
  grid: {
    left: "2%",
    right: "2%",
    bottom: "10%",
    top:"20%",
    containLabel: true,
  },
  tooltip: {
    trigger: "axis",
    axisPointer: {
      type: "cross",
      crossStyle: {
        color: "#999",
      },
    },
  },
  legend: {
    x: "center",
    y: "bottom",
    data: ['今日', '昨日'],
    textStyle: {
      color: "#999",
    },
  },
  xAxis: [
    {
      type: "category",
      data: ['0','2','4','6','8','10','12','14','16','18','20','22']
    },
  ],
  yAxis: [
    {
      name:"h",
      type: "value",
      min: 0,
      max: 1000,
      interval: 200,
      axisLabel: {
        formatter: "{value} ",
      },
    },
  ],
  series: [
   {
    name: '今日',
      type: 'line',
      stack: 'Total',
      smooth: true,
      lineStyle: {
        width: 0
      },
      showSymbol: false,
      areaStyle: {
        opacity: 0.8,
        color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
          {
            offset: 0,
            color: 'rgb(128, 255, 165)'
          },
          {
            offset: 1,
            color: 'rgb(1, 191, 236)'
          }
        ])
      },
      emphasis: {
        focus: 'series'
      },
      data: [140, 232, 101, 264, 90, 340, 250,232, 101, 264, 90, 340, 250]
   },
   {
      name: '昨日',
      type: 'line',
      stack: 'Total',
      smooth: true,
      lineStyle: {
        width: 0
      },
      showSymbol: false,
      areaStyle: {
        opacity: 0.8,
        color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
          {
            offset: 0,
            color: 'rgb(0, 221, 255)'
          },
          {
            offset: 1,
            color: 'rgb(77, 119, 255)'
          }
        ])
      },
      emphasis: {
        focus: 'series'
      },
      data: [120, 282, 111, 234, 220, 340, 310,232, 101, 264, 90, 340, 250]
    },
  ],
};
const chart = ref<any>("");
onMounted(() => {
  // 图表初始化
  chart.value = markRaw(
    echarts.init(document.getElementById(props.id) as HTMLDivElement)
  );

  chart.value.setOption(options);

  // 大小自适应
  window.addEventListener("resize", () => {
    chart.value.resize();
  });
});
const downloadEchart = () => {
  // 获取画布图表地址信息
  const img = new Image();
  img.src = chart.value.getDataURL({
    type: "png",
    pixelRatio: 1,
    backgroundColor: "#fff",
  });
  // 当图片加载完成后，生成 URL 并下载
  img.onload = () => {
    const canvas = document.createElement("canvas");
    canvas.width = img.width;
    canvas.height = img.height;
    const ctx = canvas.getContext("2d");
    if (ctx) {
      ctx.drawImage(img, 0, 0, img.width, img.height);
      const link = document.createElement("a");
      link.download = `充电功率图.png`;
      link.href = canvas.toDataURL("image/png", 0.9);
      document.body.appendChild(link);
      link.click();
      link.remove();
    }
  };
};
</script>
<style lang="scss" scoped>
.title {
  display: flex;
  justify-content: space-between;

  .download {
    cursor: pointer;

    &:hover {
      color: #409eff;
    }
  }
}
</style>
